You could try and get a private prescription and see if you could get dydrogesterone from an Irish pharmacy.
However if it were me and that was the progestogen I wanted to use, which it one day might be, I would use the oral combination.
I take oral estradiol in the combined pill Zoely and it is great.
There is a lot of fear mongering around both PPI medications and oral estradiol which is completely disproportionate to the actual magnitude of the very small risks.
This often leads to people taking much bigger risks such as untreated or poorly treated chronic reflux or hypoestrogenism, or in your case choosing metabolically less favourable or invasive progestins.
Of course the absolute risk with any progestin is very small however, and it is about finding which best meets your needs overall.